package java07;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Scanner;

public class Main049 {
	public class Main  throws InterruptedException{
	    public static List<Integer> list;
	    public static void main(String[] args) {
	        Scanner sc = new Scanner(System.in);
	        Main.list =Collections.synchronizedList(new ArrayList());
	        		/*你的答案*/
	        /*已有的一些多线程频繁在Main.list中增删元素的代码*/

	    }
	}

